Stockholders' Equity - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Number of Shares
Outstanding, beginning balance (in shares)	816,717	1,162,505	1,686,902
Granted (in shares)	0	0	92,610
Exercised (in shares)	(35,625)	(329,878)	(580,861)
Canceled (in shares)	0	(15,910)	(36,146)
Outstanding, ending balance (in shares)	781,092	816,717	1,162,505	1,686,902
Weighted- Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)	$ 7.42	$ 7.51	$ 7.00
Granted (in dollars per share)	0	0	9.49
Exercised (in dollars per share)	6.68	7.63	6.15
Canceled (in dollars per share)	0	9.41	10.76
Outstanding, ending balance (in dollars per share)	$ 7.46	$ 7.42	$ 7.51	$ 7.00
Weighted- Average Remaining Contractual Term (in Years)
Outstanding	3 years 8 months 12 days	5 years 9 months 18 days	6 years 1 month 6 days	5 years 4 months 24 days
Vested and Expected to Vest at September 30, 2022
Outstanding (in shares)	781,092
Exercisable (in shares)	706,377
Outstanding, weighted average exercise price per share (in dollars per share)	$ 7.46
Exercisable, weighted average exercise price per share (in dollars per share)	$ 7.23
Outstanding, weighted average remaining contractual term (in years)	3 years 8 months 12 days
Exercisable, weighted average remaining contractual term (in years)	3 years 8 months 12 days